Samacheer Kalvi Class 8 Science Acids and Bases Questions - 1

Question: 1

In basic solution turmeric indicator paper changes from yellow to ______

(A) Red

(B) Yellow

(C) Green

(D) Blue

Question: 2

We brush our teeth with tooth paste because it is ______

(A) Acidic

(B) Basic

(C) Both a and b

(D) None of these

Question: 3

Red ant sting contains ______

(A) Formic acid

(B) Oxalic acid

(C) Sulphuric acid

(D) Acetic acid

Question: 4

Acids are _____ in taste.

(A) Bitter

(B) Salty

(C) Sour

(D) Sweet

Question: 5

Base is a substance that gives _____ on dissolving in water.

(A) OH^-

(B) H

(C) OH

(D) H⁺

Question: 6

Magnesium oxides are used for treating

(A) Teeth decay

(B) Head pain

(C) Acidity

(D) None of these

Question: 7

In acidic solution, blue litmus changes into _____ colour.

(A) Red

(B) White

(C) Green

(D) Blue

Question: 8

Sodium hydroxide is a

(A) Alkali

(B) Acid

(C) Base

(D) Oxide

Question: 9

Acid mixed with base forms _____

(A) Water

(B) Salt

(C) Salt and water

(D) No reaction

Question: 10

Aqueous solutions of _____ conduct electricity.

(A) Salt and base

(B) Salt

(C) Base

(D) Acid